Switch



Feb. 26 1924. 1,485,080

E. T. JONES SWITCH Filed Dec. 27. 1921 2 Sheets-Sheet 1 FIG-.1. FIG-.23.

FIGHT.

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@l fozneq Feb. 26 1924. 1,485,080

I E. T. JONES SWITCH Filed Dec. 2'7. 1921 2 Sheets-$heet 2 (1H0: may;

Patented Feb. 26, 1924.

UNITED STATES EDWARD THOMAS JONES, OF NEW ORLEANS, LOUISIANA.

SWITCH.

Application filed December 27, 1921. Serial No. 525,153.

To all whom it may concern:

Be it known that I, Eownno THOMAS JONES, a citizen of the United States, residing at New Orleans, in the parish of Orleans and State of Louisiana, have invented a certain new and useful Improvement in a Switch, of which the following is a specification.

My invention relates broadly to electric switches and more particularly to an electric switch construction for operation with radio telegraph and telephone transmitting and receiving apparatus.

Reference is made to my Patent 1,415,179, dated May 9, 1922-, for radio controlling devices in which I have claimed broadly the device of the present application.

The object of the present invention is to provide an electrical switch construction 0perative for rapidly transferring connections of a radio antenna system between the receiving and transmitting apparatus.

Another object of my invention is to provide an antenna transfer switch construction which simultaneously cuts in the power for the transmitter and closes auxiliary circuits when the switch is thrown to transmitting position to connect the antenna with the transmitting apparatus.

A further object of the invention is to provide an antenna switch construction having simplified parts readily assembled and capable of quantity production in manufacture.

Another object of the invention is to provide an arrangement of switch blades such that the receiving apparatus is protected from heavy surges and discharges from the antenna system when the switch is thrown from transmitting to receiving, and also to rovide a means for protecting the receiver at all times from heavy electrical discharges which might surge in the antenna system.

Otherand further objects of my invention will be understood from the following specification with reference to the accompanying drawings, in which:

Figure 1 is a plan view of the antenna transfer switch; Fig. 2 is a side elevation of the antenna transfer switch illustrating 'the receiving side of the switch; Fig. 3 is a front end view of the switch showing the operating knob; Fig. 4 is a side elevation of the switch looking at the transmitting side; and Fig. 5 is a perspective view of the switch showing the electrical connections with radio transmitting and receiving apparatus.

The switch construct-ion comprises broadly a horizontal insulated base or other support- 1ng member and-a vertical insulated support carried thereby at the top of which a horizontal shaft is supported in an elongated bearing. The shaft is rotatable b means of an insulated hand knob. The sha t carries at its opposite ends a set of switch blades disposed at acute angles with relation to the vertical support. The blades are adapted to cooperate with switch contact jaws carried in different positions on the insulated vertical support. The switch blades and cooperating contact jaws serve to connect the receiving apparatus with the antenna system when the shaft is rotated in one direction and serve to connect the transmitting apparatus with the antenna system and at the same time connect the power with the transmitter and close auxiliary power circuits when the shaft is rotated in the opposite direction. The blades are arranged such that in transferring the antenna from the transmitter to the receiver the transmitter power is cut off before the antenna system. is disconnected from the transmitting apparatus and before the receiving apparatus is connected with the antenna system whereby opportunity is given for the antenna to drain any accumulated charge before being thrown into connection with the receiving apparaus. While in receiving position the transmitter switch blade and contact jaw may be so related as to form a protective spark gap circuit through the transmitter inductance across the receiver to prevent heavy surges from passing through the primary of the receiver circuit. 7

Referring to the drawings, the insulated base or supporting member of the switch .is indicated by reference character 1 and the insulated vertical support for the switch at 2. The bearing member 3 is carried upon the upper extremity of the vertical support and provides an elongated bearing for rotatable shaft 46 operative by insulated knob 20 secured to the end of the shaft by means of socket 44 and set screw 45. The rotatable shaft 46 is secured at the opposite end of bearing 3 by nut 47. Switch blades 5 and 6 and insulated section 11 are rotated by said shaft. The blades and insulated section 11 are angularly dis- ILL-5 posed upon the shaft at acute angles with relation to the vertical support. The blade 5 is referred to as the transmitter switch blade and is shorter in length than the receiver switch blade 6 which is secured adjacent thereto. Blade 5 cooperates to enter switch contact jaws 7 secured to the insulated vertical support 2 by binding post 9 below the bearing number 3. The opposite switch blade 6 is adapted to cooperate and make connection with switch contact jaws 8 secured upon the lower portion of the vertical support by binding post 10. Electrical connection with an antenna system is had with hearing member 3 by means of bindin post 4 secured to the bearing memher 3 y machine screw 4". An insulated section 11 is carried by the rotatable switch shaft adjacent operating knob 20 and socket 44 by angular member 50 to which the insulated section 11 is secured by machine screws 49. The insulated section 11 carries at its extremity a terminal 12 adapted to enter and close an electrical circuit between jaws l4 and 15 carried on the lower portion of the verticall insulated support on the transmitting sidb of the switch. The contact jaws 14 and 15 are secured to "the insulated vertical support 2 of the switch by screws 16" and 17, one of each of which are secured to binding posts 16 and 17 on the op osite sides of the vertical support.

eferrin to Fig. 5 of the drawings the switch is il ustrated with the rotatable shaft in such position that the transmitting switch blade 5 is just leaving the contact jaws 7 and a switch blade 6 is just ready to enter the contact jaws 8 to connect the antenna to the receiver and in this position the insulated section 11 with its termi nal 12 is entirely free from the contact jaws 14 and 15. The antenna 5 of the radio system connects to binding post 4. The receiving apparatus is connected to binding post 10 and includes in circuit the primary windin 34 and round connection 33. Inductive y associate with the primary winding is secondary winding 35 tuned by variable condenser 36. Any form of receiver may be connected to this adjustable circuit 35 and 36. The receiver illustrated comprises a thermionic vacuum tube having a heated filament 39 energized by battery 38, grid element 40 and plate element 41. Grid condenser and grid leak 37 are connected in circuit with grid 40. The plate 41 connects to the output circuit including B battery 43 and telephone receivers 42.

The transmitting apparatus connects to binding post 9 on the switch and the circuit includes inductance 21 and ground 22. Inductively coupled to the inductance 21 is primary winding 23 of the closed circuit of the transmitter which in this case is represented as a rotary spark gap oscillating cir- '27 and the motor 29 is only completed when the switch knob 20 is rotated to move terminal 12 into contact jaws 14 and 15 which electrically connect through binding posts 16 and 17 with the power circuits. The operating knob 20 may be secured at the opposite end of the shaft 46, if desired. Greater personal protection is offered the operator however, by placing the operating knob at the end of the shaft opposite the blades 5 and 6 to reduce the accidental touching of these blades by the operator while changing the switch from one position to another.

In the operation of the antenna transfer switch the operator grasps switch knob 20 and rotates the shaft in a counter-clockwise direction in changing from a receiving period to a transmitting period. Switch blade 6 leaves the contact jaws 8 disconnecting the receiver from the antenna system and the switch blade 5 moves into contact jaws 7 connecting the antenna system with the transmitting apparatus. Terminal 12 then moves between contact jaws 14 and 15 completing the power circuits for the transmitter. Upon completion of the transmittin period the operator rotates the switch kno in a clockwise direction to transfer the antenna from the transmitting apparatus to the receiving apparatus. The power circuit is first disconnected from the transmitter by the displacement of terminal 12 from contact jaws 14 and 15. The power is then thrown off of the transformer circuit and the rotary spark gap is brought to rest. Switch blade 5 moves out of contact jaws 7 permitting a draining of the antenna of any charges retained from the transmitting period for a differential of time after the power'has been cut off and before the receiver is connected with the antenna. Switchblade 6 then moves into contact jaws 8 connecting the antenna to the receiver. The receiver may be protected from heavy surges by moving the blades in such position as to allow a small clearance between the transmitter blade 5 and contact jaws 7 whereb a protective spark gap to ground throug the low impedance path of the transmitting inductance 21 is provided across the receiver.

It will be understood that the base or supporting member 1 may be of any suitable material and that it is not necessa that it be made of insulating materia Furthermore, I may dispense with the base and mount the elongated support 2 directly upon a vertical panel or other supporting member.

While I have described the invention with relation to radio systems the switch has numerous applications and I intend no limitations upon its use other than as set forth in the appended claims. a

What I claim and desire to secure by Let ters Patent of the United States is as follows:

1. A switch comprising a supportin member, an insulated vertical elongated support thereon, a rotatable shaft longitudinally positioned on the extremity of said support, a bearing member for said shaft substantially throughout the length of said support, laterally projecting switch blades carried by said shaft, contacts arranged on opposite sides of said elongated support and adapted to receive said switch blades in their respective rotated positions.

2. A switch comprising a supporting member, an insulated vertical elongated support carried thereby, a plurality of contacts carried on opposite sides of said support, a shaft carricd longitudinally upon the upper extremity of said su port, a journal for said shaft substantially t roughout the length of said support, switch blades carried by said shaft disposed at acute angles with said support and adapted to be received by said contacts upon rotation of said shaft in either direction.-

3. A switch comprising a supporting member, a vertical elongated support carried thereby, a pluralit of contacts secured to 0 posite sides of sai support, a rotatable sha t mounted longitudinally along the top of said support, a bearing member for said shaft extending substantially throughout the length of said support, switch blades carried by said shaft, one of said blades having a metallic terminal at the extremity thereof electrically insulated from said shaft, said terminal being adapted to engage one of said contacts, and an insulated knob for rotating said shaft whereby said blades are connected to respective contacts on oppo site sides of said support.

4. A switch comprising a supporting member, an insulated vertical elongated support carried thereby, a shaft carried longitudinally at the up er extremity of said sup ort, an insulated knob at one end of sai shaft and an acutely angled switch blade carried at the opposite end of said shaft and a second blade carried by said' shaft adjacent said knob, means supporting said shaft throughout the distance between said blades, contacts secured to opposite sides of said support and adapted toreceive said acutely angled blade when said shaft is rotated in either of its extreme positions and a contact on one side of said support adapted to receive said second blade, said second blade having a metallic terminal separated from said shaft by an insulated section and adapted to close an electrical circuit through said contact.

5. A switch comprising in combination a supporting member, a vertical elongated support carried thereby, a rotatable shaft carried at the extreme upper portion of said support and journaled substantially throughout its length, switch blades carried by said shaft and arranged at an acute angle with said support, a single contact secured to one side of said vertical support, a pluralityof contacts carried on the opposite side of said support and means whereb said switch blades are connected with sai contacts upon rotation of said shaft.

6. A switch comprising in combination a supporting member, a vertical elongated support carried thereby, a rotatable shaft carried at the extreme upper portion of said support, a bearing member for said shaft substantially throughout the length of said support, switch blades carried by said shaft and arranged at an acute angle with said support, a contact secured to one side of said vertical support, another contact secured to the opposite side of said support, a bifurcated contact carried on said opposite side of said support and means whereby said switch blades are connected-with said contacts upon rotation of said shaft.

7. A switch comprising in combination a supporting member, a .vertical elongated support carried thereby, a rotatable shaft carried at the extreme upper portion of said support, an insulated knob at one end of said shaft, an acutely angled switch blade carried by said shaft at the end opposite said'knob, a second blade carried by said shaft at the end adjacent said knob, means supporting said shaft substantially throughout the distance between said blades, a contact secured to one side of said vertical support, another contact secured to the opposite side of said vertical support, each of said contacts cooperating with said acutely angled switch blade and a bifurcated contact carried by said opposite side of said support and arranged to cooperate with said second blade, said second blade including an insulated section and a metallic terminal.

EDWARD THOMAS JONES. 

